[Iwatasan]

Unless of course the leaked battery acid opens the packaging for you.

I don't collect sealed systems, just sealed games. I have a couple handhelds in my collection I don't intend to actually play with anymore, and I removed the batteries from them. I just keep the batteries separate, so I do still have them, the package is still "complete," but when the batteries inevitably start to leak they won't ruin the hardware or anything else.